David p



(No Model.) I I D. P. THOMSON 8a A. H. ARMSTRONG.

ARMATURE FOR DYNAMO ELEG'IQRIG MACHINES. No. 565,647. Patented Augn ll, 1.896.

.A ENT, QFFIQE.

IDAV-IDP. 'rnonsoN AND LnER'rn. ARMSTRONG, or SUl-IENEOTADY, 1\'nw YORK, nssrenons o THE GENERAL ELECTRIC COMPANY, or

NEW YORK.

.nsinnross ronfovnnnio snscrsic MACHINES.

srncrrrcnrron forming part of Letters PatentNo. 565,647, nd August 11-, 1896.

Q 1 Application filed may 13,

To aZZ whom it-may concern.

Be it known that we, DAVID P. THOMSON and ALBERT ll. ARMSTRONG, citizens of'the specification.

Ourfinven-tion relates to dynamoelectric United States, residing at Schenectady,in the county of Schenectadyjstate of New York have invented certain new and useful Inamovements in Dynamo .-.Electric Machines, (Case No. 379,) of which the following is a machines, and has for its object to provide a convenient way of mounting the coils upon the cores in such structures, and in particular upon their armatures. It may well be applied to field-magnets where sucha construction as. the one indicated would be suitable,

and has particular utility in modern typesof alternatingcurrent'apparatus.

In general our invention consists in a core provided with slots in which coils are vto be inserted, and having teeth of a peculiar shape. The teeth overlap a part of the slot with an L-shaped projection. The under side of the L-shaped projection i'sundereut', and the rear portion of the L has a small notch, also' undercut, so that a wedge. may be driven over the coils to retain them in place. The opening' in the slot is approximately one-half of the entire slot \\'idth,and the coils are dropped intoit in such a way that the insulation of the coil is not disturbed. The slot may also be lined with insulation, which is not abraded in the process of inserting'the coils, and after,

. these latter are putin place a wedge is driven: in, so that they are firmly retained, preserving.

their jgositionagainst centrifugal strains, if the constructionbe used in a revolving armaturc,an l against magnetic stress. 1 I

The accompanying drawings show our device, Figure 1 being a plan oi a stationary armature; Fig. 2, a side elevation of the part shown in Fig. l, and Figs. 3, 4,-and5 detailviews oi modifications I In Fig. 1, A is the core. B 13 are the coils. O O are the teeth, and D are the slots or openin gs between them. The shape of the teeth.

is best seenv in Fig. 2. Each teeth 0 basaprojecting portion 0, (shown on the lei't in the lgure,) having anundercut side. c, andiuoon the back of the L shaped' tooth is a similar surfacec The operation of inserting the coils is also best seen in this figure. The coil B is'first inserted and is then movedto the right, occupyi-n gthe, lower ri ht hand portion of the slots;- Thenext coil B is then inserted and. occupies the left-hand'portion of eachslot, each coil of course spanning as many teeth as may be'desired, either the polar pitch of the machine or such portion thereof as the v 1 v 60 I In Fig. 3v a section is shown with all four of:

designer may arrange;

the coils which would ordinarily be used in place.

the interior of the slot, and at E is shown the 'Wedge,'preferab1y-of wood, which is driven in over this insulation. It will be-scen that the wedge does not come in contact with the coil,

- so that its insulation is never impaired. The upper two 'coils B? and Win Fig. 3 are inserted in the same way as those shown in Fig. 2. It will be observed that they occupy a On thelei't inF-ig. 2 and in Fig-'3 at" cl is shown a sheet of insulation applied to trifle less than half the'width of theslots.

In practice the slight inequalities of coils and the thickness of the surrounding sheet of insulation will be sufficient to make'theui fit closely, but without any tcndei'icyto abrade the insulation in insertion... o

In Fig. 4 we show a modified i'orin of the tooth '0, the other parts being as shown in the pre-:

ceding figures. In this case the undercut portion 0" of the tooth. forms the entire o'vcrhang on the left side, and similarly the-undercut portion 0 forms the entire overhan g upon theright.' l

, In Fig. 5 a further modification is shown,

although this is not the preferred formJn which one side of the toothis straight and r the base of. the L forms theovcrhang upon the other side.

Byform'ingeach of the coils in the slot we areenabled to contract the opening and yet insert the 0011 without abrasion,.

.the coils'being 'siniply'dropped into the slot and thenadjusted in positiomthe wedges E 1 J51 afterward comprcssing them,sufficiently to make a; firrn'engagemon i Iugother forms of I 9 I such'a way as to occupy substantially an aliquot part .of'

- vform the coil is divided, but is made smaller 'time through the slot and afterward ax-rang will occupy, as above. pointed portion of the cross section of the slot."

4 What we claim by Letters consti hction with whieh we are familiar this result'has heen-obtained by separating the wiros'of the coil and'inseriing them one ata chine, comprising; a core having sides of which areparallel with the radiipassing' through their centers, L-shaped teeth having-undercut portions, coils each occupying an aliquot portion of the slot; and wedges engaging teeth for retaining the coils in place.

2. An armature for a dynamo-electric ma chine, comprising a slotted core, the sidesot ing them in place. This,-however',has the great disadvantage or a'endering uncertain; the i'nsuiation of-thecoilas a whole, Instill another form with h'ch weare familiar the coil is compressed-as it passes through the slot, thus rendering ahr'asion'of the insulation liable to occur; while in still another than the portion of the slot through which it entersyand the coils are then separatedby Wedges previously placed in the slot-,the construction being troublesome to put irrplace and insecure after it is arranged. a 3

An added feature of usefulness in our in: vention lies in the fact that the slots have I sides parallel with the radius passing through their centers, so that the sides of-the coils may be substantially straight, and yeiftheyv out, an aliquot.

through their centers, separately wound and? insulated coils the workin g portions of which occupy aliquot parts of different slots, L shaped teeth between ing undercut portions upon the base aud back of the L, Y cut'portion's for holding the coils in place.

In witness whereof we havehereunto set our hands this 8th day of May; 1896. DAVID P. THOMSON. ALBERT H. ARMSTRONG.

Witnesses;

. B. B. HULL,

E. W. CADY.

It is manifest that our invention is not limited to the use of 'iour'coils in each slot-,. as other nur'nhers' more'or less; could he used by simply altering the-'sizeof the coils. I

as new, and desire secure V Patent of the United-States; isc. .1. An armature for a dynamo-electrio maslots thethe slots, the teeth hav-- with the undercut portion of'. the

-the slots being parallel'to the radii passing and wedges engaging withthe under- 

